We obtain an enhanced phase-contrast image of biological samples from the single-shot X-ray phase-contrast imaging technique by using weighted mean filter imaging processing. The center-weighted mean filter is applied to Moiré-less 1stharmonic image restored by Fourier-transform phase-retrieval method. Consequently, the quality of X-ray differential phase-contrast image is drastically improved. The signal-to-noise ratio has been enhanced at least 25.9 % by the enhancement process with the weight value of 1.3. The enhancement of phase information can be explained by the behavior of weight filter in the complex domain.
We investigate the angular field of view (AFOV) of a holographic image reconstructed from the digital Fresnel hologram in holographic display. The theoretical analysis clarifies that the AFOV of a holographic image is fundamentally determined by the hologram numerical aperture (HNA) other than a diffraction angle of pixel pitch of a pixelated modulator. This property is proved for various types of the digital holograms using a numerical simulation and optical experiments. The high-HNA hologram reconstructs the image with a high viewing angle, whereas the image contraction is inevitable due to the Nyquist sampling criterion in the hologram synthesis. We demonstrate the method for reconstructing the holographic image with a high viewing angle without image contraction.
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